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You divide the difference of the diameter by two because you are placing the cake directly in the middle and that is how much width of mirror will be around the bottom. 16-14=2 /2= 1 inch around the bottom.
18-14=4 /2= 2 inches around the bottom. Depends on what you like. I like more and would probably up it to a 20 inch mirror. 20-14=6 /2= 3 inch base around the bottom layer.
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